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arXiv 1608.07975hep-phhep-ex
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电偶极矩预测中的抵消机制

The cancellation mechanism in the predictions of electric dipole moments

Ligong Bian, Ning Chen

摘要:

对宇宙重子不对称性的解释需要超越标准模型的CP破坏。我们提出了一个一般的取消机制的理论预测的电子电偶极矩(EDM),夸克色-EDM,和温伯格运营商。在2013年ACME合作组发布的当前电子EDM约束和最近的$^{199}$ Hg EDM实验允许希格斯扇区中相对较大的CP破坏。在$\sim\mathcal{O}(0.1-1)$ GeV附近,重希格斯玻色子的质量分裂可以导致这种抵消机制,质量简并的程度决定了CP破坏相的大小.我们通过对CP破坏的两重Higgs模型和最小超对称标准模型的研究来解释这一点。当新物理模型中的Higgs扇区存在CP破坏和混合时,这种抵消机制是普遍存在的。在这种情况下,CP破坏阶段可以排除或检测的$^{225}$ Ra EDM实验的精度达到$\sim10^{-28}\,e\cdot{\rm cm}$,以及未来的对撞机。

英文摘要:

The interpretation of the baryon asymmetry of the Universe necessitates the CP violation beyond the Standard Model (SM). We present a general cancellation mechanism in the theoretical predictions of the electron electric dipole moments (EDM), quark chromo-EDMs, and Weinberg operators. A relative large CP violation in the Higgs sector is allowed by the current electron EDM constraint released by the ACME collaboration in 2013, and the recent $^{199}$Hg EDM experiment. The cancellation mechanism can be induced by the mass splitting of heavy Higgs bosons around $\sim\mathcal{O}(0.1-1)$ GeV, and the extent of the mass degeneracy determines the magnitude of the CP-violating phase. We explicate this point by investigating the CP-violating two-Higgs-doublet model and the minimal supersymmetric Standard Model. The cancellation mechanism is general when there are CP violation and mixing in the Higgs sector of new physics models. The CP-violating phases in this scenario can be excluded or detected by the projected $^{225}$Ra EDM experiments with precision reaching $\sim10^{-28}\,e\cdot{\rm cm}$, as well as the future colliders.

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